wenilandClaude Opus 4.8
8d82beaacf
On-hardware calibration (5-point corner+center tap) confirms the FT3168 on the 2.06 panel reports directly in panel pixel space (~0..409 x ~0..501), correctly oriented with no axis swap or mirror — a center tap reads ~(209,228) against the 410x502 panel center (205,251), a 1:1 mapping within finger error. The existing raw passthrough is correct; record the verified result in the driver comment. The temporary on-screen TOUCH_DEBUG overlay used to gather this has been removed. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
#include "../../hal/touch_hal.h"
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#include "board.h"
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#include <Arduino.h>
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#include <Wire.h>
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// Minimal capacitive-touch reader for the FT3168 (FocalTech). Same data layout
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// as the FT3168 on the AMOLED-1.8 board, so we reuse the inline reader instead
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// of vendoring the GPLv3 Arduino_DriveBus library.
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// reg 0x02: low nibble = active finger count
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// reg 0x03 / 0x04: X1 high (low nibble) + X1 low
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// reg 0x05 / 0x06: Y1 high (low nibble) + Y1 low
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//
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// Axis orientation: verified on hardware (v2 Phase 1). The FT3168 reports
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// directly in the panel's pixel space (~0..409 x ~0..501), correctly oriented
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// (x grows left->right, y grows top->bottom, no axis swap). A center tap reads
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// ~(209,228) vs the 410x502 panel center (205,251) — a 1:1 mapping within
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// finger error. Raw values pass straight through; no mirror/swap/scale needed.
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static volatile bool touch_data_ready = false;
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static volatile bool touch_pressed = false;
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static volatile uint16_t touch_x = 0;
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static volatile uint16_t touch_y = 0;
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static void IRAM_ATTR touch_isr(void) {
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touch_data_ready = true;
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}
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static void touch_read_into_shared_state(void) {
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Wire.beginTransmission(FT3168_ADDR);
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Wire.write(0x02);
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if (Wire.endTransmission(false) != 0) { touch_pressed = false; return; }
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if (Wire.requestFrom((uint8_t)FT3168_ADDR, (uint8_t)5) != 5) { touch_pressed = false; return; }
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uint8_t fingers = Wire.read() & 0x0F;
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uint8_t xH = Wire.read();
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uint8_t xL = Wire.read();
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uint8_t yH = Wire.read();
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uint8_t yL = Wire.read();
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if (fingers == 0 || fingers > 5) {
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touch_pressed = false;
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return;
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}
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touch_x = ((uint16_t)(xH & 0x0F) << 8) | xL;
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touch_y = ((uint16_t)(yH & 0x0F) << 8) | yL;
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touch_pressed = true;
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}
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void touch_hal_init(void) {
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// FT3168 power-mode register 0xA5 = 0x00: active scanning.
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Wire.beginTransmission(FT3168_ADDR);
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Wire.write(0xA5);
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Wire.write(0x00);
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Wire.endTransmission();
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// Verify the controller answers (FT3168 chip-id is reg 0xA0).
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Wire.beginTransmission(FT3168_ADDR);
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Wire.write(0xA0);
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if (Wire.endTransmission(false) == 0 && Wire.requestFrom((uint8_t)FT3168_ADDR, (uint8_t)1) == 1) {
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Serial.printf("Touch FT3168 ID=0x%02X (addr 0x%02X)\n", Wire.read(), FT3168_ADDR);
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} else {
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Serial.printf("Touch FT3168 ID read failed (addr 0x%02X)\n", FT3168_ADDR);
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}
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pinMode(TP_INT, INPUT_PULLUP);
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attachInterrupt(TP_INT, touch_isr, FALLING);
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Serial.println("Touch attached on INT pin");
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}
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void touch_hal_read(uint16_t* x, uint16_t* y, bool* pressed) {
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if (touch_data_ready) {
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touch_data_ready = false;
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touch_read_into_shared_state();
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}
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*x = touch_x;
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*y = touch_y;
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*pressed = touch_pressed;
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}
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